Question

I’m missing a-20516 in my scared stiff, do I need an a20516 like your site says?

Answer 1

In this case, you're looking for the Audio/Video replacement kit:

https://www.pinsound.org/shop/index.php?id_product=42&controller=product&id_lang=1

You'll also need a "regular" DMD controller board (as specified on the product description)